tootling

/T UW1 T AH0 L IH0 NG/
verb
  1. 1

    To make a soft toot sound.

  2. 2

    To play (a musical instrument) making such a sound.

  3. 3

    To go (somewhere); to amble aimlessly.

  4. 4

    To transport (someone somewhere).

noun
  1. 1

    The sound of a tootle.

Source: https://en.wiktionary.org/wiki/tootle, https://en.wiktionary.org/wiki/tootling